EP 0231590 A2 19870812 - Frame alignment of tributaries of a T.D.M. bit stream.
Title (en)
Frame alignment of tributaries of a T.D.M. bit stream.
Title (de)
Rahmensynchronisierung von untergeordneten Kanälen eines Zeitmultiplex-Bitstromes.
Title (fr)
Alignement de trame des signaux subordonnés d'un courant de bits à multiplexage temporel par répartition.
Publication
Application
Priority
CA 500085 A 19860122
Abstract (en)
A frame alignment method and apparatus are disclosed for aligning the t.d.m. frames of tributaries, each including channel bytes synchronously multiplexed with a frame synchronizing byte, which are byte-interleaved to form overall t.d.m. frames identified by a frame synchronizing word, the tributaries having arbitrary frame phases with respect to one another. A channel counter (24) is reset in response (28) to the frame synchronizing word, and for each tributary in response (40) to the frame synchronizing byte the count of the channel counter (24) is used to determine an offset value which is stored in a memory (38). Each byte of each tributary is stored in a RAM (20) at an address determined by subtracting (44) the respective stored (38) tributary offset from the current count of the channel counter (24), whereby the tributaries are stored in the RAM (20) in a frame-aligned manner. Reading of the tributary bytes can be effected sequentially (26) or via a connection memory (46) providing a time switching function.
IPC 1-7
IPC 8 full level
H04J 3/06 (2006.01)
CPC (source: EP US)
H04J 3/0602 (2013.01 - EP US); H04J 3/0629 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE FR GB NL SE
DOCDB simple family (publication)
EP 0231590 A2 19870812; EP 0231590 A3 19880824; CA 1253639 A 19890502; JP S62173829 A 19870730; US 4698806 A 19871006
DOCDB simple family (application)
EP 86308298 A 19861024; CA 500085 A 19860122; JP 626787 A 19870116; US 82193186 A 19860124